// Copyright (c) Matthias Koch
//
// See the NOTICE file distributed with this work for additional information
// regarding copyright ownership.  rubicon licenses this file to you under 
// the Apache License, Version 2.0 (the "License"); you may not use this 
// file except in compliance with the License.  You may obtain a copy of the 
// License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the 
// License for the specific language governing permissions and limitations
// under the License.
// 
using System;
using System.Reflection;

using PostSharp.Aspects;
using PostSharp.Aspects.Configuration;
using PostSharp.Aspects.Serialization;

namespace XValidation
{
  /// <summary>
  /// Acts as an aspect that intercepts method calls in order to validate their argument and return values against applied <see cref="IValidationAttribute"/>s.
  /// </summary>
  [Serializable]
  [AspectConfiguration (SerializerType = typeof (MsilAspectSerializer))]
  public class ValidationAttribute : OnMethodBoundaryAspect
  {
    [NonSerialized]
    private static readonly ValidationInfoProvider s_infoProvider = new ValidationInfoProvider();

    [NonSerialized]
    private InterceptionValidator _validator;

    public override void RuntimeInitialize (MethodBase method)
    {
      _validator = new InterceptionValidator (s_infoProvider, method);
    }

    public override void OnEntry (MethodExecutionArgs args)
    {
      var context = new ValidationContext (args);
      _validator.ValidateArguments (context);
    }

    public override void OnSuccess (MethodExecutionArgs args)
    {
      var context = new ValidationContext (args);
      _validator.ValidateReturnValue (context);
    }
  }
}